Favors.devSignal Check by Shuttlewright
Technical readiness checks to see if your site is blocking AI search crawlers
by Shuttlewright
About Signal Check by Shuttlewright
Signal Check is a diagnostic tool designed for website owners and developers to verify if their site is technically accessible to AI search crawlers. It provides a read-only, pass-or-fix checklist for individual public pages, ensuring that robots.txt configurations and page metadata are correctly set up for AI visibility.
Key features
- Crawler Verification: Checks seven specific AI user agents, including GPTBot, OAI-SearchBot, PerplexityBot, and ClaudeBot, to see if they are blocked in your robots.txt.
- Technical Audits: Validates page basics such as HTTP status, title tags, meta descriptions, and initial HTML text content.
- Indexing Signals: Detects noindex directives, Open Graph tags, and JSON-LD structured data.
- MCP Integration: Offers a read-only MCP endpoint (
/mcp) for integration into AI tools that support remote MCP over HTTP.
Pricing & plans
- Free Scan: Allows users to check a single public page, robots.txt, and llms.txt without signing up. Results are displayed on the page and are not saved.
- Monthly Subscription ($19/month): Provides access to saved history, change comparisons, and report downloads. Workspaces are created manually by the team.
How it works
Users enter a public URL to receive a technical breakdown of their site's readiness. The tool performs read-only requests to analyze public files and page content. It is strictly a technical checklist and does not measure search rankings, AI mentions, or citation probability.
Frequently asked questions about Signal Check by Shuttlewright
Does this tool measure my site's AI search rankings or mentions?+
No. It is a technical checklist for accessibility and does not query AI answer engines or predict how often your site will be cited.
Can I use this to check private or password-protected pages?+
No. The tool only performs read-only requests on public web addresses and cannot access private network pages.
Is the llms.txt file required for my site?+
No. The tool reports on the presence of llms.txt, but it is optional and its specific benefits are currently unproven.
How do I access the paid features?+
You can subscribe for $19 per month via Polar. Because workspaces are created by hand, access is not instant; you will receive sign-in details via email.
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